> -----Original Message-----
> From: IBM Mainframe Discussion List On Behalf Of Aaron Walker
>
> In addition to what Mr. Wolf said, I would recommend getting
> up to a more current version of the JVM (you're over a year
> out of date).
Yeah, I noticed that, too.
> I also saw a thread on MVS-OE where you were
> discussing turning off JIT. You can try it both ways. It is
> often rather unusual circumstances where you would turn off
> the JIT, mostly for short jobs.
Tried it; no change. Set it back enabled.
> I'm not sure how you would specify JVM parameters with this
> product (if it's not abundantly clear, then you can always
> set them with the envvar IBM_JAVA_OPTIONS).
>
> To turn on verbose garbage collection (low overhead and very
> necessary):
> -verbose:gc
Tried that with and without the colon. Both ways just add "gibberish" to
stdout:
[EMAIL PROTECTED]@[EMAIL PROTECTED]@[EMAIL PROTECTED]@[EMAIL PROTECTED]@[EMAIL
PROTECTED]@[EMAIL PROTECTED]@[EMAIL PROTECTED]@½.@@[EMAIL PROTECTED]@[EMAIL
PROTECTED]
13:11:57,201 INFO ÝServer¨ Release ID: JBoss ÝWonderLand¨ 3.2.6 (build:
CVSTag=JBoss_3_2_6 date=200410140106)
Presumably the first line (the "gibberish") is from verbosegc; the second is
the first line logged by the application. Other "gibberish" lines are now
interspersed in stdout. IOW, it's not telling me anything in any useful or
understandable format.
I notice all the other "switches" discussed so far are preceded by an uppercase
letter. Should I be spelling it "-Xverbosegc"? The diagnosis manual doesn't
say....
> You can set your JVM heap min (Xms) and max (Xmx) size (based
> on garbage collection output):
> -Xms128M -Xmx200M
Vendor gave us 128M and 1024M respectively for those options.
> This switch will make things start up a little faster, but
> may slow things down in the long run. I use it for shorter
> batch jobs:
> -Xquickstart
Would be nice to find all these "switches" documented in one place....
-jc-
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